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i've had this pair for around 6 months, and they're around 7 months. Do you think I can assume she's just gaining weight? We'll go to the vet just to be sure.How long have you had your guinea pigs and how old are they? Gestation is anywhere from 60 to 73 days.
Turn both pigs over and compare their private parts. I wouldn't be surprised if the other isn't female. And read https://www.guineapigcages.com/foru...inea-pig-is-pregnant-And-how-far-along-is-she
That said, guinea pigs can have different body shapes, just like people do. Some are longer and skinnier, others shorter and fatter.
I tried to look, but they were so fidgety that I couldn't get a close look. The other "girl" in the cage had something poking out of her area though. Is that a sign that she's a male?
No, pay attention to what @bpatters just said and follow her instructions. And, as she says, "there's no such thing as too fidgety".
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Piggy girl (note the "Y" shape)
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Piggy boy (note the separate penis and the swelling of the testicles below the genitals)